US10624113B2 - Method for transmitting and receiving signal through sidelink in next generation wireless communication system, and apparatus therefor - Google Patents

Method for transmitting and receiving signal through sidelink in next generation wireless communication system, and apparatus therefor Download PDF

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US10624113B2
US10624113B2 US16/089,460 US201716089460A US10624113B2 US 10624113 B2 US10624113 B2 US 10624113B2 US 201716089460 A US201716089460 A US 201716089460A US 10624113 B2 US10624113 B2 US 10624113B2
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symbol
subframe
sidelink
control signal
reserved
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US20190124673A1 (en
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Hanbyul Seo
Yunjung Yi
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LG Electronics Inc
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LG Electronics Inc
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0032—Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0078—Timing of allocation
    • H04L5/0082—Timing of allocation at predetermined intervals
    • H04L5/0083—Timing of allocation at predetermined intervals symbol-by-symbol
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0092—Indication of how the channel is divided
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0023—Time-frequency-space

Definitions

  • the present invention relates to a next generation wireless communication system, and more particularly, to a method of transmitting/receiving a signal through a sidelink in a next generation wireless communication system and apparatus therefor.
  • 3GPP 3rd Generation Partnership Project
  • LTE Long Term Evolution
  • FIG. 1 is a diagram showing a network structure of an Evolved Universal Mobile Telecommunications System (E-UMTS) as a mobile communication system.
  • E-UMTS is an evolved form of the UMTS and has been standardized in the 3GPP.
  • the E-UMTS may be called a Long Term Evolution (LTE) system.
  • LTE Long Term Evolution
  • the E-UMTS mainly includes a User Equipment (UE), base stations (or eNBs or eNode Bs), and an Access Gateway (AG) which is located at an end of a network (E-UTRAN) and which is connected to an external network.
  • UE User Equipment
  • base stations or eNBs or eNode Bs
  • AG Access Gateway
  • an eNB can simultaneously transmit multiple data streams for a broadcast service, a multicast service and/or a unicast service.
  • One or more cells may exist per eNB.
  • the cell is set to use a bandwidth such as 1.25, 2.5, 5, 10, 15 or 20 MHz to provide a downlink or uplink transmission service to several UEs. Different cells may be set to provide different bandwidths.
  • the eNB controls data transmission or reception of a plurality of UEs.
  • the eNB transmits downlink (DL) scheduling information of DL data so as to inform a corresponding UE of time/frequency domain in which data is transmitted, coding, data size, and Hybrid Automatic Repeat and reQest (HARM)-related information.
  • DL downlink
  • HARM Hybrid Automatic Repeat and reQest
  • the eNB transmits uplink (UL) scheduling information of UL data to a corresponding UE so as to inform the UE of a time/frequency domain which may be used by the UE, coding, data size and HARQ-related information.
  • UL uplink
  • An interface for transmitting user traffic or control traffic can be used between eNBs.
  • a Core Network (CN) may include the AG and a network node or the like for user registration of the UE.
  • the AG manages mobility of a UE on a Tracking Area (TA) basis.
  • One TA includes a plurality of cells.
  • LTE Long Term Evolution
  • WCDMA Wideband Code Division Multiple Access
  • UE User Equipment
  • the technical task of the present invention is to propose a method of transmitting/receiving a signal through a sidelink in a next generation wireless communication system and apparatus therefor.
  • a method of transmitting/receiving a sidelink signal through a subframe configured with a plurality of symbols by a user equipment in a wireless communication system including receiving a first sidelink control signal including symbol information for a sidelink data signal in a predetermined first symbol of the subframe, receiving the sidelink data signal in the subframe according to the first sidelink control signal, and transmitting a second sidelink control signal including response information on the sidelink data signal in a second symbol of the subframe.
  • a user equipment in a wireless communication system including a wireless communication module and a processor connected to the wireless communication module, wherein the processor is configured to receive a first sidelink control signal including symbol information for a sidelink data signal in a predetermined first symbol of the subframe, receive the sidelink data signal in the subframe according to the first sidelink control signal, and transmit a second sidelink control signal including response information on the sidelink data signal in a second symbol of the subframe.
  • the first symbol is determined on the assumption that symbols reserved for a downlink control signal exist in the subframe as many as a maximum number and the second symbol includes a symbol right before a symbol reserved for an uplink control signal in the subframe.
  • the first symbol may include a symbol reserved for the downlink control signal and a symbol defined next to one symbol reserved as a guard period for timing advance application among a plurality of the symbols.
  • information on the number of symbols reserved for the downlink control signal may be received from a base station through a higher layer.
  • a third sidelink control signal may be transmitted through a specific symbol of the subframe before receiving the sidelink data signal.
  • the third sidelink control signal may include response information on a sidelink data signal received in a different subframe before the subframe.
  • the symbol reserved for the downlink control signal is reserved by starting from a first symbol of the subframe. And, the symbol reserved for the uplink control signal includes a last symbol of the subframe.
  • a sidelink signal can be transmitted/received in a next generation wireless communication system more efficiently.
  • FIG. 1 is a diagram schematically illustrating a network structure of an evolved universal mobile telecommunications system (E-UMTS) as an exemplary radio communication system.
  • E-UMTS evolved universal mobile telecommunications system
  • FIG. 2 is a diagram illustrating structures of a control plane and a user plane of a radio interface protocol between a UE and an evolved UMTS terrestrial radio access network (E-UTRAN) based on the 3GPP radio access network specification.
  • E-UTRAN evolved UMTS terrestrial radio access network
  • FIG. 3 is a diagram illustrating physical channels used in a 3GPP system and a general signal transmission method using the same.
  • FIG. 4 is a diagram illustrating the structure of a radio frame used in a long term evolution (LTE) system.
  • LTE long term evolution
  • FIG. 5 is a diagram illustrating the structure of a DL radio frame used in an LTE system.
  • FIG. 6 is a diagram illustrating the structure of a UL subframe in an LTE system.
  • FIG. 7 is a diagram illustrating examples of a connection scheme between TXRUs and antenna elements.
  • FIG. 8 is a diagram illustrating an example of a self-contained subframe structure.
  • FIG. 9 shows a detailed configuration example of a self-contained subframe.
  • FIG. 10 is a conceptual diagram of D2D direct communication.
  • FIG. 11 shows one example of sidelink resource configuration according to an embodiment of the present invention.
  • FIG. 12 shows one example that an additional Timing Advance (TA) is applied in sidelink resource configuration according to an embodiment of the present invention.
  • TA Timing Advance
  • FIG. 13 shows another example of sidelink resource configuration according to an embodiment of the present invention.
  • FIG. 14 shows another example that an additional TA is applied in sidelink resource configuration according to an embodiment of the present invention.
  • FIG. 15 shows one example of sidelink resource configuration in which HARQ-ACK resource for sidelink data transmission is configured according to an embodiment of the present invention.
  • FIG. 16 shows another example of sidelink resource configuration in which HARQ-ACK resource for sidelink data transmission is configured according to an embodiment of the present invention.
  • FIG. 17 is a block diagram of a communication apparatus according to an embodiment of the present invention.
  • LTE-A LTE-advanced
  • a base station may be used as a broad meaning including a remote radio head (RRH), an eNB, a transmission point (TP), a reception point (RP), a relay, etc.
  • RRH remote radio head
  • TP transmission point
  • RP reception point
  • relay a relay
  • FIG. 2 is a diagram illustrating structures of a control plane and a user plane of a radio interface protocol between a UE and an E-UTRAN based on 3GPP radio access network specifications.
  • the control plane refers to a path used for transmission of control messages, which is used by the UE and the network to manage a call.
  • the user plane refers to a path in which data generated in an application layer, e.g. voice data or Internet packet data, is transmitted.
  • a physical layer of a first layer provides an information transfer service to an upper layer using a physical channel.
  • the physical layer is connected to a media access control (MAC) layer of an upper layer via a transmission channel.
  • Data is transmitted between the MAC layer and the physical layer via the transmission channel.
  • Data is also transmitted between a physical layer of a transmitter and a physical layer of a receiver via a physical channel.
  • the physical channel uses time and frequency as radio resources. Specifically, the physical channel is modulated using an orthogonal frequency division multiple Access (OFDMA) scheme in DL and is modulated using a single-carrier frequency division multiple access (SC-FDMA) scheme in UL.
  • OFDMA orthogonal frequency division multiple Access
  • SC-FDMA single-carrier frequency division multiple access
  • the MAC layer of a second layer provides a service to a radio link control (RLC) layer of an upper layer via a logical channel.
  • the RLC layer of the second layer supports reliable data transmission.
  • the function of the RLC layer may be implemented by a functional block within the MAC layer.
  • a packet data convergence protocol (PDCP) layer of the second layer performs a header compression function to reduce unnecessary control information for efficient transmission of an Internet protocol (IP) packet such as an IPv4 or IPv6 packet in a radio interface having a relatively narrow bandwidth.
  • IP Internet protocol
  • a radio resource control (RRC) layer located at the bottommost portion of a third layer is defined only in the control plane.
  • the RRC layer controls logical channels, transmission channels, and physical channels in relation to configuration, re-configuration, and release of radio bearers.
  • a radio bearer refers to a service provided by the second layer to transmit data between the UE and the network.
  • the RRC layer of the UE and the RRC layer of the network exchange RRC messages.
  • the UE is in an RRC connected mode if an RRC connection has been established between the RRC layer of the radio network and the RRC layer of the UE. Otherwise, the UE is in an RRC idle mode.
  • a non-access stratum (NAS) layer located at an upper level of the RRC layer performs functions such as session management and mobility management.
  • NAS non-access stratum
  • DL transmission channels for data transmission from the network to the UE include a broadcast channel (BCH) for transmitting system information, a paging channel (PCH) for transmitting paging messages, and a DL shared channel (SCH) for transmitting user traffic or control messages.
  • Traffic or control messages of a DL multicast or broadcast service may be transmitted through the DL SCH or may be transmitted through an additional DL multicast channel (MCH).
  • UL transmission channels for data transmission from the UE to the network include a random access channel (RACH) for transmitting initial control messages and a UL SCH for transmitting user traffic or control messages.
  • RACH random access channel
  • Logical channels which are located at an upper level of the transmission channels and are mapped to the transmission channels, include a broadcast control channel (BCCH), a paging control channel (PCCH), a common control channel (CCCH), a multicast control channel (MCCH), and a multicast traffic channel (MTCH).
  • BCCH broadcast control channel
  • PCCH paging control channel
  • CCCH common control channel
  • MCCH multicast control channel
  • MTCH multicast traffic channel
  • FIG. 3 is a diagram illustrating physical channels used in a 3GPP system and a general signal transmission method using the same.
  • the UE When power is turned on or the UE enters a new cell, the UE performs an initial cell search procedure such as acquisition of synchronization with an eNB (S 301 ). To this end, the UE may adjust synchronization with the eNB by receiving a primary synchronization channel (P-SCH) and a secondary synchronization channel (S-SCH) from the eNB and acquire information such as a cell identity (ID). Thereafter, the UE may acquire broadcast information within the cell by receiving a physical broadcast channel from the eNB. In the initial cell search procedure, the UE may monitor a DL channel state by receiving a downlink reference signal (DL RS).
  • DL RS downlink reference signal
  • the UE may acquire more detailed system information by receiving a physical downlink control channel (PDCCH) and receiving a physical downlink shared channel (PDSCH) based on information carried on the PDCCH (S 302 ).
  • a physical downlink control channel (PDCCH)
  • PDSCH physical downlink shared channel
  • the UE may perform a random access procedure (S 303 to S 306 ) with the eNB.
  • the UE may transmit a specific sequence through a physical random access channel (PRACH) as a preamble (S 303 and S 305 ) and receive a response message to the preamble through the PDCCH and the PDSCH associated with the PDCCH (S 304 and S 306 ).
  • PRACH physical random access channel
  • the UE may additionally perform a contention resolution procedure.
  • the UE may receive a PDCCH/PDSCH (S 307 ) and transmit a physical uplink shared channel (PUSCH)/physical uplink control channel (PUCCH) (S 308 ), as a general UL/DL signal transmission procedure.
  • the UE receives downlink control information (DCI) through the PDCCH.
  • the DCI includes control information such as resource allocation information for the UE and has different formats according to use purpose thereof.
  • control information that the UE transmits to the eNB on UL or receives from the eNB on DL includes a DL/UL acknowledgment/negative acknowledgment (ACK/NACK) signal, a channel quality indicator (CQI), a precoding matrix index (PMI), a rank indicator (RI), and the like.
  • ACK/NACK DL/UL acknowledgment/negative acknowledgment
  • CQI channel quality indicator
  • PMI precoding matrix index
  • RI rank indicator
  • the UE may transmit the control information such as CQI/PMI/RI through a PUSCH and/or a PUCCH.
  • FIG. 4 is a diagram illustrating the structure of a radio frame used in an LTE system.
  • the radio frame has a length of 10 ms (327200 ⁇ Ts) and includes 10 equal-sized subframes.
  • Each of the subframes has a length of 1 ms and includes two slots.
  • Each slot has a length of 0.5 ms (15360 Ts).
  • Each slot includes a plurality of OFDM symbols in the time domain and includes a plurality of resource blocks (RBs) in the frequency domain.
  • RBs resource blocks
  • one RB includes 12 subcarriers ⁇ 7 (or 6) OFDM symbols.
  • a transmission time interval which is a unit time for data transmission, may be determined in units of one or more subframes.
  • the above-described structure of the radio frame is purely exemplary and various modifications may be made in the number of subframes included in a radio frame, the number of slots included in a subframe, or the number of OFDM symbols included in a slot.
  • FIG. 5 is a diagram illustrating control channels included in a control region of one subframe in a DL radio frame.
  • one subframe includes 14 OFDM symbols.
  • the first to third ones of the 14 OFDM symbols may be used as a control region and the remaining 11 to 13 OFDM symbols may be used as a data region, according to subframe configuration.
  • R 0 to R 3 represent reference signals (RSs) or pilot signals for antennas 0 to 3 , respectively.
  • the RSs are fixed to a predetermined pattern within the subframe irrespective of the control region and the data region.
  • Control channels are allocated to resources unused for RSs in the control region.
  • Traffic channels are allocated to resources unused for RSs in the data region.
  • the control channels allocated to the control region include a physical control format indicator channel (PCFICH), a physical hybrid-ARQ indicator channel (PHICH), a physical downlink control channel (PDCCH), etc.
  • PCFICH physical control format indicator channel
  • PHICH physical hybrid-ARQ indicator channel
  • PDCCH physical downlink control channel
  • the PCFICH physical control format indicator channel, informs a UE of the number of OFDM symbols used for the PDCCH in every subframe.
  • the PCFICH is located in the first OFDM symbol and is configured with priority over the PHICH and the PDCCH.
  • the PCFICH is composed of 4 resource element groups (REGs) and each of the REGs is distributed over the control region based on a cell ID.
  • REG resource element groups
  • One REG includes 4 resource elements (REs).
  • An RE indicates a minimum physical resource defined as one subcarrier by one OFDM symbol.
  • the PCFICH value indicates values of 1 to 3 or values of 2 to 4 depending on bandwidth and is modulated using quadrature phase shift keying (QPSK).
  • QPSK quadrature phase shift keying
  • the PHICH physical hybrid-ARQ indicator channel
  • the PHICH indicates a channel through which DL ACK/NACK information for UL HARQ is transmitted.
  • the PHICH includes one REG and is cell-specifically scrambled.
  • the ACK/NACK signal is indicated by 1 bit and is modulated using binary phase shift keying (BPSK).
  • BPSK binary phase shift keying
  • the modulated ACK/NACK signal is spread with a spreading factor (SF) of 2 or 4.
  • SF spreading factor
  • a plurality of PHICHs mapped to the same resource constitutes a PHICH group.
  • the number of PHICHs multiplexed to the PHICH group is determined depending on the number of spreading codes.
  • the PHICH (group) is repeated three times to obtain diversity gain in the frequency domain and/or the time domain.
  • the PDCCH is allocated to the first n OFDM symbols of a subframe.
  • n is an integer equal to or greater than 1 , indicated by the PCFICH.
  • the PDCCH is composed of one or more control channel elements (CCEs).
  • CCEs control channel elements
  • the PDCCH informs each UE or UE group of information associated with resource allocation of transmission channels, that is, a paging channel (PCH) and a downlink shared channel (DL-SCH), UL scheduling grant, HARQ information, etc.
  • PCH and the DL-SCH are transmitted through a PDSCH. Therefore, the eNB and the UE transmit and receive data through the PDSCH except for particular control information or service data.
  • Information indicating to which UE or UEs PDSCH data is to be transmitted and information indicating how UEs should receive and decode the PDSCH data are transmitted on the PDCCH.
  • a cyclic redundancy check (CRC) of a specific PDCCH is masked by a radio network temporary identity (RNTI) ‘A’ and information about data transmitted using a radio resource ‘B’ (e.g. frequency location) and using DCI format ‘C’, i.e. transport format information (e.g. a transport block size, a modulation scheme, coding information, etc.), is transmitted in a specific subframe
  • a UE located in a cell monitors the PDCCH, i.e.
  • the UEs blind-decodes the PDCCH, using RNTI information thereof in a search space. If one or more UEs having RNTI ‘A’ are present, the UEs receive the PDCCH and receive a PDSCH indicated by ‘B’ and ‘C’ based on the received information of the PDCCH.
  • FIG. 6 is a diagram illustrating the structure of a UL subframe in an LTE system.
  • an uplink subframe is divided into a region to which a PUCCH is allocated to transmit control information and a region to which a PUSCH is allocated to transmit user data.
  • the PUSCH is allocated to the middle of the subframe, whereas the PUCCH is allocated to both ends of a data region in the frequency domain.
  • the control information transmitted on the PUCCH includes an ACK/NACK, a channel quality indicator (CQI) representing a downlink channel state, an RI for Multiple Input and Multiple Output (MIMO), a scheduling request (SR) indicating a request for allocation of UL resources, etc.
  • CQI channel quality indicator
  • MIMO Multiple Input and Multiple Output
  • SR scheduling request
  • each of an eNB and a UE may perform beamforming based on CSI to obtain the multiplexing gain of MIMO antennas.
  • the eNB may command the UE to feed back CSI on a downlink signal by allocating a PUCCH (Physical Uplink Control CHannel) or a PUSCH (Physical Uplink Shared CHannel) to the UE.
  • PUCCH Physical Uplink Control CHannel
  • PUSCH Physical Uplink Shared CHannel
  • the CSI is largely classified into three information types, RI (Rank Indicator), PMI (Precoding Matrix), and CQI (Channel Quality Indication).
  • RI Rank Indicator
  • PMI Precoding Matrix
  • CQI Channel Quality Indication
  • the PMI is a value obtained by reflecting spatial characteristics of a channel, and indicates a precoding matrix index of an eNB, which is preferred by the UE based on a metric such as signal to interference and noise ratio (SINR).
  • SINR signal to interference and noise ratio
  • the CQI is a value indicating channel strength, and generally means a reception SINR that may be obtained by the eNB when the PMI is used.
  • the eNB may configure a plurality of CSI processes for the UE, and may be reported CSI for each of the CSI processes.
  • the CSI process includes CSI-RS resource for specifying signal quality and CSI-IM (interference measurement) resource, that is, IMR (interference measurement resource) for interference measurement.
  • a wavelength becomes short in the field of Millimeter Wave (mmW)
  • a plurality of antenna elements may be installed in the same area.
  • a wavelength is 1 cm in a band of 30 GHz
  • a total of 64 (8 ⁇ 8) antenna elements of a 2D array may be installed in a panel of 4 by 4 cm at an interval of 0.5 lambda (wavelength). Therefore, a recent trend in the field of mmW attempts to increase coverage or throughput by enhancing BF (beamforming) gain using a plurality of antenna elements.
  • TXRU transceiver unit
  • independent beamforming may be performed for each frequency resource.
  • a problem occurs in that effectiveness is deteriorated in view of cost when TXRU is provided for all of 100 antenna elements. Therefore, a scheme is considered, in which a plurality of antenna elements are mapped into one TXRU and a beam direction is controlled by an analog phase shifter. Since this analog beamforming scheme may make only one beam direction in a full band, a problem occurs in that frequency selective beamforming is not available.
  • a hybrid BF having B TXRUs smaller than Q antenna elements may be considered.
  • the number of beam directions that enable simultaneous transmission is limited to B or less.
  • FIG. 7 illustrates examples of a connection scheme between TXRUs and antenna elements.
  • FIG. 7 illustrates that TXRU is connected to a sub-array. In this case, the antenna elements are connected to only one TXRU. Unlike (A) of FIG. 7 , (B) of FIG. 7 illustrates that TXRU is connected to all antenna elements. In this case, the antenna elements are connected to all TXRUs.
  • W indicates a phase vector multiplied by an analog phase shifter. That is, a direction of analog beamforming is determined by W. In this case, mapping between CSI-RS antenna ports and TXRUs may be 1-to-1 or 1-to-many.
  • a self-contained subframe structure shown in FIG. 8 is considered in the fifth generation NewRAT to minimize data transmission latency in a TDD system.
  • FIG. 8 illustrates an example of a self-contained subframe structure.
  • oblique line areas indicate downlink control regions and black colored areas indicate uplink control regions. Areas having no mark may be used for downlink data transmission or uplink data transmission.
  • downlink transmission and uplink transmission are performed in due order within one subframe, whereby downlink data may be transmitted and uplink ACK/NACK may be received within the subframe.
  • the time required for data re-transmission may be reduced when an error occurs in data transmission, whereby latency of final data transfer may be minimized.
  • a time gap for switching from a transmission mode to a reception mode or vice versa is required for the eNB and the UE.
  • some OFDM symbols (OS) at the time when a downlink is switched to an uplink in the self-contained subframe structure are set to a guard period (GP).
  • Examples of the self-contained subframe type that may be configured in the system operating based on the NewRAT may consider four subframe types as follows.
  • FIG. 9 shows a detailed configuration example of a self-contained subframe.
  • Dc means a DL symbol for a DL control channel transmission
  • Dd means a DL symbol for a DL data channel transmission
  • Uc means a UL symbol for a UL control channel transmission
  • Ud means a UL symbol for a UL data channel transmission
  • GP means a symbol for a guard period between DL and UL.
  • CSI-RS means a reference signal received (Rx) symbol for measuring CSI at a UE side
  • SRS means a symbol for a sounding reference signal transmission at the UE side.
  • FIG. 10 is a conceptual diagram of D2D communication.
  • a base station may transmit a scheduling message to indicate D2D transmission/reception.
  • a UE participating in D2D communication may receive a D2D scheduling message from a base station, and perform Tx/Rx operations indicated by the D2D scheduling message.
  • a network entity such as a base station may be regarded as a sort of UE in case of transmitting and receiving signals according to a communication scheme between UEs.
  • a link directly connected between UEs shall be referred to as a D2D link
  • a link for a UE to communicate with a base station shall be referred to as an NU link
  • a link directly connected between UEs may be referred to as a SideLink (SL) conceptually in comparison with uplink or downlink.
  • SL SideLink
  • a UE 1 selects a resource unit corresponding to a specific resource from a resource pool that means a set of a series of resources and then transmits a D2D signal using the corresponding resource unit.
  • the base station may inform the UE 1 of the resource pool.
  • the resource pool may be indicated by another UE or determined as a resource determined in advance.
  • a resource pool is configured with a plurality of resource units and each UE may select and use one or a plurality of resource units for a D2D signal transmission of its own.
  • an entire frequency resource is divided into N F and an entire time resource is divided into N T , whereby total N F *N T resource units can be defined.
  • a corresponding resource pool may be repeated by period of N T subframes.
  • a single resource unit may appear periodically and repeatedly.
  • an index of a physical resource unit having a single logical resource unit mapped thereto may change in a previously determined pattern according to time.
  • a resource pool may mean a set of resource units that can be used for a transmission by a UE intending to transmit a D2D signal.
  • the above-described resource pool may be subdivided into various types. First of all, it can be classified according to a content of a sidelink signal transmitted on a resource pool. For example, like 1) to 3) in the following, a content of a sidelink signal may be classified into a sidelink data channel and a discovery signal. And, a separate resource pool may be configured according to each content.
  • SA Scheduling Assignment
  • Tx transmitting
  • MCS Modulation and Coding Scheme
  • the SA can be transmitted in a manner of being multiplexed with sidelink data on the same resource unit.
  • an SA resource pool may mean a pool of resources on which SA is transmitted by being multiplexed with sidelink data.
  • Sidelink data channel This refers to a channel used for a Tx UE to transmit user data. If SA is transmitted by being multiplexed with sidelink data on a same resource unit, a Resource Element (RE) used in transmitting SA information on a specific resource unit of an SA resource pool may be used to transmit sidelink data on a sidelink data channel resource pool.
  • RE Resource Element
  • Synchronization signal/channel This may be referred to as a sidelink synchronization signal or a sidelink broadcast channel, and mean a resource pool for a signal/channel for a receiving (Rx) UE to achieve a goal of matching time/frequency synchronization with a Tx UE in a manner that the Tx UE transmits a synchronization signal and information relevant to synchronization.
  • Rx receiving
  • SA and sidelink data can use a resource pool separated on a subframe, if a UE is able to transmit SA and sidelink data in a single subframe simultaneously, two kinds of resource pools may be configured in the same subframe.
  • a UL and a sidelink have the same attribute in that a UE performs transmission and interference. And, interference caused to an adjacent cell or UE basically has the same attribute.
  • sidelink transmission uses a time period assigned to UL.
  • sidelink transmission occurs at the same timing of DL, if there exists a UE performing DL reception by being adjacent to a sidelink Tx UE, it causes a problem that the corresponding UE receives serious interference.
  • a DL period can be utilized as a sidelink.
  • an Rx UE cab perform the same Rx operation.
  • am operation can be performed in a manner of designating a sidelink period as a separate period distinguished from a DL or UL period.
  • a method of configuring a sidelink resource can use one of A-1) to A-4) in the following.
  • a specific symbol is used as a sidelink, it may mean that the corresponding symbol is usable for data transmission of sidelink or that the corresponding symbol can be utilized for the usage of transmitting a sidelink control signal (i.e., Scheduling Assignment (SA)) for scheduling sidelink data or for the usage of transmitting HARQ-ACK for sidelink data.
  • SA Scheduling Assignment
  • a Tx UE may not use the corresponding symbol for its data transmission like a case that the corresponding symbol is used for HARQ-ACK transmission of another UE.
  • Method A-1 Assuming that a DL control signal and/or a UL control signal (SRS inclusive possibly) always exists, a resource of a sidelink is configured to use the rest of the resource.
  • a sidelink is provided to use symbols #2 to #11.
  • symbol #1 is used as a downlink like subframe configuration #2 or subframe configuration #3 in FIG. 9
  • symbol #2 can be provided to be used as a GP
  • symbols #3 to #11 can be provided to be used as sidelink.
  • a base station may operate not to configure subframe configuration in which symbol #1 becomes a downlink despite using symbols as a sidelink by starting with symbol #2.
  • a symbol region used by a sidelink may be fixed and provided not to vary unless the number of symbols in at least one SF varies.
  • Method A-2 Assuming that a resource of a sidelink uses all symbols in a subframe, it operates. Exceptionally, a GP for the switching between transmission and reception of a UE can be included. This GP may be located at a first symbol of a subframe. In this case, if a previous subframe uses a last symbol for the usage of DL transmission like the subframe configurations #0, #2, #6 and #7 of FIG. 9 , a GP can be advantageously secured between initial sidelink transmissions.
  • a base station should perform an appropriate subframe configuration so as not to use a last symbol of a previous subframe as a downlink.
  • a base station can designate a sidelink operational subframe and prevent collision by not performing DL/UL operation except sidelink in the corresponding subframe.
  • Method A-1 can advantageously transmit a UL control signal and/or a DL control signal in a sidelink operating subframe, whereas Method A-2) can advantageously maximize the number of symbols used by a sidelink.
  • Method A-3 A base station semi-statically adjusts a sidelink operating resource.
  • a sidelink can be provided to use up to symbol #12. Or, if it is able to avoid collision with a UL/DL control signal in symbol #13, a sidelink can be provided to use up to symbol #13. Or, if it is able to avoid collision with a DL control signal, symbol #0 and symbol #1 may be usable.
  • a base station informs a UE of a sidelink symbol region, which is to be used in a specific sidelink resource pool, in advance through a higher layer signal such as RRC signaling. Based on this, the UE may perform a sidelink operation. If a subframe configuration the base station intends to configure is different per subframe, a sidelink resource to be used may be configured differently in each subframe belonging to a resource pool. Moreover, depending on a UL or DL control signal a base station will schedule despite a subframe belonging to a same resource pool, it is possible to semi-statically designate a location of a symbol, which is to be used for a sidelink, differently in each subframe.
  • the base station may designate a subframe operating in sidelink only. And, the base station does not need to dynamically designate where a symbol region used as a sidelink is located in each subframe, thereby reducing the related signaling overhead.
  • Method A-4) A UE obtains a subframe configuration dynamically designated by a base station through a physical layer control signal and then transmits/receives a sidelink using a symbol (e.g., assigned as a UL data signal) not colliding with DL/UL according to the obtained subframe configuration.
  • a symbol e.g., assigned as a UL data signal
  • a start part of a period used as a sidelink may operate by Method A-4) but an end part may operate by Method A-3).
  • a UE belonging to the same cell of a Tx UE may receive a control signal of a base station and obtain a subframe configuration. Yet, a UE belonging to another cell has difficulty in receiving it and operating correctly. In case of using Method A-3), a UE out of a coverage of the base station has difficulty in receiving such a configuration.
  • SA is transmitted in a manner of a conservative configuration like Method A-1) and a symbol region used on a data channel can be designated through the SA.
  • An Rx UE detects the SA according to the conservative configuration and then receives a data channel based on the obtained information.
  • SA sidelink control channel
  • Method B-1) SA and sidelink data scheduled through the SA may be transmitted using different subcarriers in the same subframe.
  • a set of SA mapped symbols may be different from that of sidelink data channel mapped symbols like the above-described embodiment.
  • Method B-2 As another method of disposing SA, it is able to use a symbol different from that of sidelink data. According to this method, as an Rx UE firstly detects SA and then attempts sidelink data channel reception immediately, a decoding delay of the Rx UE can be reduced advantageously.
  • a sub-method may include the following method.
  • FIG. 11 shows one example of sidelink resource configuration according to an embodiment of the present invention. Particularly, FIG. 11 assumes that subframe configuration #4 of FIG. 9 is configured.
  • SA, Sd and Sc mean Scheduling Assignment (SA), sidelink data and sidelink control signal (HARQ-ACK for sidelink data), respectively.
  • SA, Sd and Sc mean Scheduling Assignment (SA), sidelink data and sidelink control signal (HARQ-ACK for sidelink data), respectively.
  • a first subframe configuration corresponds to a case that GP does not exist between Sd and Sc.
  • a second subframe configuration corresponds to a case that symbol #12 is used as GP required for switching from sidelink data transmission to HARQ-ACK reception.
  • FIG. 12 shows one example that an additional Timing Advance (TA) is applied in sidelink resource configuration according to an embodiment of the present invention.
  • TA Timing Advance
  • this method is effective when a TA for UL transmission is not applied to a sidelink.
  • the principle of providing a switching time between symbols used for a sidelink by applying an additional TA is applicable to a sidelink frame structure of a different type.
  • (Sub-method B-2-2) SA starts from a first symbol of a subframe.
  • a transmission resource of SA is configured with the same as a transmission resource of a DL control signal.
  • an operation very similar to receiving a downlink is possible.
  • the sub-method B-2-2 is combinable with the aforementioned sidelink resource configuring method A-2). If the sub-method B-2-2 is combined with other sidelink resource configuring method, base station's appropriate scheduling is required. If interference between UEs can be adjusted appropriately, a DL control signal and an SA may be transmitted in the same symbol using different frequency resources.
  • a base station informs a Tx UE that a DL control signal the corresponding UE should receive does not exist in the corresponding subframe and then allows the corresponding UE to perform sidelink signal transmission using a DL control signal period.
  • FIG. 13 shows another example of sidelink resource configuration according to an embodiment of the present invention. Particularly, it can be observed from FIG. 13 that symbol #0 and symbol #12 are used as SA and GP, respectively.
  • FIG. 14 shows another example that an additional TA is applied in sidelink resource configuration according to an embodiment of the present invention.
  • FIG. 14 shows a case of applying an additional TA.
  • sidelink transmission is performed from symbol #0 without a separate additional TA.
  • a sidelink Tx/Rx operation can be performed by configuring a last symbol of a previous subframe as a GP.
  • a base station may always configure a last symbol of a subframe previous to a sidelink Tx subframe starting from the symbol #0 as a GP, or a UE participating in sidelink transmission/reception may be provided to avoid transmitting Uc at a corresponding timing despite that the corresponding symbol is configured as Uc.
  • Method C-1) HARQ-ACK in sidelink may be transmitted in the same symbol of a UL control signal and use a different frequency resource. If a same UE needs to transmit HARQ-ACK for a DL data signal and HARQ-ACK for sidelink data at a timing simultaneously, separate transmissions are possible. FIG. 11 and FIG. 13 follow such a method.
  • Method C-2) HARQ-ACK in sidelink uses a symbol previous to a symbol used by a UL control signal.
  • FIG. 15 shows one example of sidelink resource configuration in which HARQ-ACK resource for sidelink data transmission is configured according to an embodiment of the present invention.
  • assumed in a first subframe configuration is a case that a single UE consecutively transmits SA, Sd and Sc. Eventually, Sc becomes HARQ-ACK for Sd transmitted ahead of Sd of the same subframe.
  • GP exists between Sc and Uc. This is to enable a UE having received Sc to secure a time required for switching to transmission of Uc.
  • Method C-3) HARQ-ACK in sidelink uses a symbol located at a fore part of a subframe. Namely, as an Rx UE transmits HARQ-ACK relatively quickly, a Tx UE can determine a presence or non-presence of retransmission quickly and prepare for a next transmission.
  • FIG. 16 shows another example of sidelink resource configuration in which HARQ-ACK resource for sidelink data transmission is configured according to an embodiment of the present invention.
  • a first subframe configuration of FIG. 16 shows a case that HARQ-ACK is transmitted after SA
  • a second subframe configuration of FIG. 16 shows a case that HARQ-ACK is transmitted before SA
  • a third subframe configuration of FIG. 16 shows a case that GP exists between Sc and SA.
  • SA or Sc may be located at a first symbol usable as a sidelink.
  • FIG. 17 is a block diagram of a communication apparatus according to an embodiment of the present invention.
  • a communication apparatus 1700 includes a processor 1710 , a memory 1720 , a Radio Frequency (RF) module 1730 , a display module 1740 and a user interface module 1750 .
  • RF Radio Frequency
  • the communication apparatus 1700 is shown for convenience of description and some modules thereof may be omitted. In addition, the communication apparatus 1700 may further include necessary modules. In addition, some modules of the communication apparatus 1700 may be subdivided.
  • the processor 1710 is configured to perform an operation of the embodiment of the present invention described with respect to the drawings. For a detailed description of the operation of the processor 1710 , reference may be made to the description associated with FIGS. 1 to 16 .
  • the memory 1720 is connected to the processor 1710 so as to store an operating system, an application, program code, data and the like.
  • the RF module 1730 is connected to the processor 1710 so as to perform a function for converting a baseband signal into a radio signal or converting a radio signal into a baseband signal.
  • the RF module 1730 performs analog conversion, amplification, filtering and frequency up-conversion or inverse processes thereof.
  • the display module 1740 is connected to the processor 1710 so as to display a variety of information.
  • a well-known device such as a Liquid Crystal Display (LCD), a Light Emitting Diode (LED), or an Organic Light Emitting Diode (OLED) may be used.
  • the user interface module 1750 is connected to the processor 1710 and may be configured by a combination of well-known user interfaces such as a keypad and a touch screen.
  • the above-mentioned embodiments of the present invention are disclosed on the basis of a data communication relationship between a base station and a user equipment. Specific operations to be conducted by the base station in the present invention may also be conducted by an upper node of the base station as necessary. In other words, it will be obvious to those skilled in the art that various operations for enabling the base station to communicate with the user equipment in a network composed of several network nodes including the base station will be conducted by the base station or other network nodes than the base station.
  • the term “Base Station” may be replaced with the terms fixed station, Node-B, eNode-B (eNB), or access point as necessary.
  • the embodiments of the present invention can be implemented by a variety of means, for example, hardware, firmware, software, or a combination thereof.
  • the present invention can be implemented through application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), a processor, a controller, a microcontroller, a microprocessor, etc.
  • ASICs application specific integrated circuits
  • DSPs digital signal processors
  • DSPDs digital signal processing devices
  • PLDs programmable logic devices
  • FPGAs field programmable gate arrays
  • processor a controller, a microcontroller, a microprocessor, etc.
  • the present invention can be implemented in the form of a variety of formats, for example, modules, procedures, functions, etc.
  • the software code may be stored in a memory unit so as to be driven by a processor.
  • the memory unit may be located inside or outside of the processor, so that it can communicate with the aforementioned processor via a variety of well-known parts.

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